I have found the 'Rock Harmonicon' and the 'Glass Harmonicon' but I wouldn't think either fitted the description. It might have meant HARMONIUM, which is possibly more likely to be repaired by an accordion/concertina repairer? For an ANGLO concertina, there may be more than one way to play a note, either on push or pull. But some people find a simplified notation easier than a score - Malley's Melodeon books contain a form of tablature.